CVE-2018-21029 Information

Description

LICENSE README.md cvefilelist cvelist nvdcve nvdpages.sh scripts test-CVE-2017-1882.markdown test-CVE-2017-18822.markdown tmpvendorlinks DISPUTED LICENSE README.md cvefilelist cvelist nvdcve nvdpages.sh scripts test-CVE-2017-1882.markdown test-CVE-2017-18822.markdown tmpvendorlinks systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS. Server Name Indication (SNI) is not sent and there is no hostname validation with the GnuTLS backend. NOTE: This has been disputed by the developer as not a vulnerability since hostname validation does not have anything to do with this issue (i.e. there is no hostname to be sent).

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://blog.cloudflare.com/dns-encryption-explained/ https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xmlL199-L207 https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xmlL196-L207 https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.cL62-L63 https://github.com/systemd/systemd/issues/9397 https://github.com/systemd/systemd/pull/13870 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4NLJVOJMB6ANDILRLDZK26YGLYBEPHKY/ https://security.netapp.com/advisory/ntap-20191122-0002/ https://tools.ietf.org/html/rfc7858section-4.1

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8